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Old 10-28-2009, 10:52 PM   #1
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where in the code does it say that a junction box has to be grounded

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Old 10-28-2009, 11:03 PM   #2
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Only in about a zillion places, provided that the box is metal.

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Old 10-28-2009, 11:08 PM   #3
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thanks have a harder question you interested
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Old 10-28-2009, 11:11 PM   #4
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Just about everywhere in the codebook if you have metal box yes you must ground it properly.

{ it the same way in France so it is no diffrence at all }

Merci.
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Old 10-28-2009, 11:18 PM   #5
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heres one; four conductor 10awg mc connected to a 3 pole breaker in a 120/208 volt 3 phase 4 wire panel board and is used for a multiwire branch circuit to serve several 120 volt computers nonlinear loads when calculaing the ampacity of wire is the neutral counted as a current carring conductor?
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Old 10-28-2009, 11:24 PM   #6
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Quote:
Originally Posted by 2green View Post
heres one; four conductor 10awg mc connected to a 3 pole breaker in a 120/208 volt 3 phase 4 wire panel board and is used for a multiwire branch circuit to serve several 120 volt computers nonlinear loads when calculaing the ampacity of wire is the neutral counted as a current carring conductor?
This setup is very common and what more you will have to understand the Haromaic effect and the result some area you will have to use super netural aka larger netural than phase conductors

However with that question it is moot point due you did not tell us what is the load so I can able tell you the answer.

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Old 10-28-2009, 11:28 PM   #7
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Yes. 2008 NEC 310.15(B)(4)(c)

...as Marc said, it is due to harmonics.
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Old 10-28-2009, 11:32 PM   #8
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Oh contrair monfrair its on my home work im an apprentice you should be able to get an answer if journeyman are familar with the code. im having problems with this code book thats why im here.
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Old 10-28-2009, 11:33 PM   #9
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thanks willis you are the man!
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Old 10-28-2009, 11:46 PM   #10
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here is another brain teaser a transformer is supplied by a 277v circuit. The transformer delivers 24volts for use in a control circuit. are one of the two 24volt wires requierd to be grounded by the NEC?

Last edited by 2green; 10-28-2009 at 11:49 PM.
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Old 10-29-2009, 12:11 AM   #11
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Quote:
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here is another brain teaser a transformer is supplied by a 277v circuit. The transformer delivers 24volts for use in a control circuit. are one of the two 24volt wires requierd to be grounded by the NEC?
Yes and No depending on if on class two supply or class three supply that will make the diffrence and IIRC it will be in art 250 { not sure which spot due they change some of details }

The same way with French Electrical codes

Oh by the way I am not Journeyman I am in Master electrician in both Wisconsin and Paris France so I am famauir with both of them.

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Old 10-29-2009, 12:18 AM   #12
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thank guys im tring to cram for midterm i finished my homework just wanted to let yall know you have been a big help even you frenchy. now my new born needs me good night online people thank again
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Old 10-29-2009, 12:22 AM   #13
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sorry had to go let you know tomarrow thanks again french electrican
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Old 10-29-2009, 06:17 AM   #14
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man, it's just not fair.
when i went to school, there was a library where you went TO it to get information.
nowadays, you just go online and have other people do your homework for you....
it's just not fair....

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Old 10-29-2009, 11:08 AM   #15
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It is best to understand "why" as opposed to just going by the "rules"...

As for the grounding of the electrical box, basically ANYTHING metal around electrical wiring should be grounded. Another term is bonded.

The reason for this is that a wire can come loose and touch that metal. Then a person comes along, touches the metal, then may be electrocuted.

If the metal is grounded and a "hot" wire touches the metal, this will create a short, overload the breaker, the breaker will trip turning off the electricity, and the metal is then safe to touch by a person.

So you will see all metal associated with electrical things grounded. Ranges, washers, dryers, electrical boxes, circuit breaker panel/cover, etc.

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